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2004 IMO Shortlist Problems/N5

Revision as of 03:36, 16 August 2011 by Mathmdmb (talk | contribs) (Created page with "We call a positive integer alternate if its decimal digits are alternately odd and even. Find all positive integers <math>n</math> such that <math>n</math> has an alternate multi...")
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We call a positive integer alternate if its decimal digits are alternately odd and even. Find all positive integers $n$ such that $n$ has an alternate multiple.

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